https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248065
Bug ID: 248065
Summary: Linuxulator: 32-bit compat + send with MSG_NOSIGNAL
Product: Base System
Version: CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Attachment #216539 text/plain
mime type:
Created attachment 216539
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=216539&action=edit
minimal repro
Apparently, with a sufficiently large payload and the MSG_NOSIGNAL flag,
blocking send turns out not quite as blocking as expected. So far this is only
observable with 32-bit Linux applications:
% /compat/linux/usr/bin/cc -DSERVER -DCLIENT -std=c99 -Wall -m32 eagain-bug.c
-pthread -o eagain-bug
% ./eagain-bug
server started
client started
connection accepted
[server] Sending 100000 bytes...
[server] sent: 49032
[server] Sending 100000 bytes...
[server] sent: -1
[server] send: Resource temporarily unavailable
See attachment for the code. (Or grab it from
https://github.com/shkhln/unexpected-eagain.)
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